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电压互感器的作用是：把高电压按比例关系变换成100V或更低等级的标准二次电压，供保护、计量、仪表装置使用。同时，使用电压互感器可以将高电压与电气工作人员隔离。电压互感器虽然也是按照电磁感应原理工作的设备，但它的电磁结构关系与电流互感器相比正好相反。电压互感器二次回路是高阻抗回路，二次电流的大小由回路的阻抗决定。当二次负载阻抗减小时，二次电流增大，使得一次电流自动增大一个分量来满足一、二次侧之间的电磁平衡关系。可以说，电压互感器是一个被限定结构和使用形式的特殊变压器。

The voltage transformer is used to convert high voltage to 100V or lower standard secondary voltage, for protection, metering and instrumentation. At the same time, voltage transformer can be used to isolate high voltage and electrical workers. The voltage transformer is also a device that works according to the principle of electromagnetic induction, but its electromagnetic structure relation is the opposite of the current transformer. The secondary circuit of the voltage transformer is the high impedance circuit, and the secondary current is determined by the impedance of the loop. When the secondary load impedance decreases, the secondary current increases, and the current automatically increases one component to meet the electromagnetic balance between one and two sides. It can be said that a voltage transformer is a special transformer that is defined and used. 

电压互感器是发电厂、变电所等输电和供电系统不可缺少的一种电器。精密电压互感器是电测试验室中用来扩大量限，测量电压、功率和电能的一种仪器。

A voltage transformer is an electrical appliance that is indispensable to the transmission and power supply system of power plant and substation. Precision voltage transformer is an instrument for measuring voltage, power and electrical power in an electric test chamber. 

电压互感器和变压器很相象，都是用来变换线路上的电压。但是变压器变换电压的目的是为了输送电能，因此容量很大，一般都是以千伏安或兆伏安为计算单位；而电压互感器变换电压的目的，主要是给测量仪表和继电保护装置供电，用来测量线路的电压、功率和电能，或者用来在线路发生故障时保护线路中的贵重设备、电机和变压器，因此电压互感器的容量很小，一般都只有几伏安、几十伏安，最大也不超过一千伏安。

The voltage transformer is similar to the transformer, which is used to change the voltage on the line. But the purpose of the transformer voltage is to transport the power, so the capacity is very large, and it is usually measured in kilovolt ampere or mevolt. The purpose of transformation and voltage transformer voltage, mainly to power a measuring instrument and relay protection devices, used to measure the line voltage, power and energy, or used in the circuit failure protection circuit of expensive equipment, motor and transformer, voltage transformer capacity is small, therefore, generally only a few volt-ampere, dozens of volt-ampere, biggest and no more than one kva. 

线路上为什么需要变换电压呢?这是因为根据发电、输电和用电的不同情况线路上的电压大小不一，而且相差悬殊，有的是低压220V和380V，有的是高压几万伏甚至几十万伏。要直接测量这些低压和高压电压，就需要根据线路电压的大小，制作相应的低压和高压的电压表和其他仪表和继电器。这样不仅会给仪表制作带来很大的困难，而且更主要的是，要直接制作高压仪表，直接在高压线路上测量电压。那是不可能的，而且也是绝对不允许的。

Why do you need to change the voltage on the line? This is because according to the different situation of power generation, transmission and power line voltage on the sizes, and six to one, have a plenty of low voltage 220 v and 380 v, have a plenty of high-pressure tens of thousands of volts or even hundreds of thousands of volts. To directly measure the low voltage and high voltage, it is need according to the size of the line voltage, make corresponding low pressure and the high voltage meter and other meters and relays. This not only makes it difficult to make instrumentation, but also, more importantly, to make the high-pressure instrument directly and measure the voltage directly on the high-voltage line. That's impossible, and absolutely not allowed. 

如果在线路上接入电压互感器变换电压，那么就可以把线路上的低压和高压电压，按相应的比例，统一变换为一种或几种低压电压，只要用一种或几种电压规格的仪表和继电器，例如通用的电压为100V的仪表，就可以通过电压互感器，测量和监视线路上的电压。

If online access voltage transformer transform voltage on the road, you can put on a line of low voltage and high voltage, according to the corresponding proportion, unified transformation for one or several low voltage, as long as the use of one or more of the following instruments and relay of voltage specification, such as general voltage of 100 v instrument, can through the voltage transformer, measuring and monitoring the voltage on the line.